U.S. Antimissile System Goes Live in South Korea

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A United States military vehicle arrived in Seongju, South Korea, last month as part of the Terminal High Altitude Area Defense, or Thaad, antimissile system.CreditCreditKim Jun-beom/Yonhap, via Reuters

SEOUL, South Korea — An American missile-defense system deployed to counter growing threats from North Korea has gone into operation in South Korea, officials said on Tuesday.

The installation of the Terminal High Altitude Area Defense battery has roiled the South Korean presidential campaign, partly over questions of who will pay for it, and drawn objections from China, which said the deployment undermined its own missile defense abilities.

The United States and South Korea began installing the radar and other important components of the system, known as Thaad, last week at an abandoned golf course in Seongju, 135 miles southeast of Seoul, after reaching an agreement to deploy it last July.

The system “is operational and has the ability to intercept North Korean missiles” and defend South Korea, said Col. Robert Manning III, a spokesman with the United States military in Seoul, the South Korean capital. His statement was echoed by the South Korean Defense Ministry, whose representative, Moon Sang-gyun, said the battery “has acquired an initial capability to deal with North Korea’s nuclear and missile threat.”

The announcement came ahead of a presidential election next week in South Korea that has been troubled by tension over the North’s nuclear weapons program and confusion about President Trump’s approach toward the Korean Peninsula. On Monday, Mr. Trump declared that he would meet North Korea’s dictator, Kim Jong-un, under the right circumstances.

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A Thaad launcher in Seongju on Monday.CreditYonhap/European Pressphoto Agency

Mr. Trump caused alarm in South Korea on Thursday when he told Reuters that he wanted the South Korean government to pay for the Thaad system, whose cost he estimated at $1 billion. South Korea has repeatedly told its people that the Americans agreed to pay for the system and its operation and maintenance, with South Korea providing land and support infrastructure.

On Sunday, the White House national security adviser, Lt. Gen. H. R. McMaster, called his South Korean counterpart, Kim Kwan-jin. Mr. Kim’s office later said that the two had “reconfirmed what has already been agreed” about the system’s costs.

But the confusion was far from over.

General McMaster later told Fox News that the United States would stick to its word “until any renegotiation.”

“The last thing I would ever do is contradict the president of the United States,” he told Fox News. “What the president has asked us to do is to look across all of our alliances and to have appropriate burden-sharing, responsibility-sharing. We’re looking at that with our great ally South Korea; we’re looking at that with NATO.”

Such comments led many South Koreans to suspect that the Trump administration might try to renegotiate the Thaad deal or demand that South Korea increase its annual contribution, estimated at $820 million last year, to help pay for maintaining American troops in the country.

On Tuesday, South Korea’s main opposition party, the Democrats, called the government’s decision to accept the Thaad deployment “a total failure of diplomacy.”

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The American antimissile system — Terminal High Altitude Area Defense, known as Thaad — in South Korea has been deemed operational. The system was deployed in response to inflating threats from North Korea.Published OnMay 2, 2017CreditCreditReuters

The party’s presidential candidate, Moon Jae-in, is leading polls by a large margin ahead of the election next Tuesday to choose the successor of the recently ousted President Park Geun-hye. Ms. Park agreed to the Thaad deployment before she was impeached for corruption in December. She was formally removed from office in March.

“At first, they said we needed to provide the land only. Now, while our country was in the middle of an election campaign, they sneaked the Thaad in, and then demanded that we pay the cost, too,” Mr. Moon said Monday during a campaign speech. “Does this make sense?”

He has called for an immediate suspension of the Thaad deployment. Mr. Moon, a liberal, had already pledged to review South Korea’s decision to accept the system if elected. He said South Korea was already paying a heavy price for the Thaad deployment, referring to a boycott of South Korean brands among angry Chinese.

On Tuesday, China restated its vehement opposition to the antimissile system and warned there would be consequences.

“We’re opposed to the United States’ deploying the Thaad antimissile system in South Korea, and we urge all sides involved to immediately halt deployment,” Geng Shuang, a spokesman for the Chinese Ministry of Foreign Affairs, said at a regular news briefing in Beijing. “As well, we’re determined to take the necessary measures to defend our own interests.”

Two B-1B American strategic bombers were deployed over the Korean Peninsula on Monday for a joint drill with South Korea’s air force, the South’s Defense Ministry said Tuesday. North Korea condemned it as a “reckless” act that was pushing the peninsula “closer to the brink of nuclear war,” but Seoul said the exercise was meant to help deter North Korean provocations.

Chris Buckley contributed reporting from Beijing.

A version of this article appears in print on , on Page A8 of the New York edition with the headline: U.S. Antimissile System Goes Live in South Korea Despite Critics’ Complaints. Order Reprints | Today’s Paper | Subscribe